Six molecules of the same amino acid join to form one chain.
The table shows the total number of each type of atom before and after the chain forms.
| Type of atom | In the six amino acid molecules | In the chain |
|---|---|---|
| Carbon | 18 | 18 |
| Hydrogen | 42 | 32 |
| Nitrogen | 6 | 6 |
| Oxygen | 12 | 7 |
Use the data to give the formula of the small molecule formed and calculate how many molecules of it are produced.
A second chain is made from nine molecules of the same amino acid.
Calculate the total number of oxygen atoms in this chain.